NUCAPT Literature Database

From NUCAPT

91–100 of 439 records found matching your query (RSS):


Select All    Deselect All
 |   | 
Details
   print
  Records Links
Type Seidman, D. N.; Current, M. I.; Pramanik, D.; Wei, C. Y.
  Publication Direct observations of the primary state of radiation damage of ion-irradiated tungsten and platinum Volume Journal Article
Pages 1981
  Abstract Nuclear Instruments and Methods  
  Corporate Author  
Publisher 182-183  
Editor 1
  Summary Language 477-481 Series Editor  
Abbreviated Series Title A brief summary of the major results of Cornell work on the primary state of radiation damage in ion-irradiated tungsten and plantinum is presented. The primary research tool for this research is the field-ion microscope (FIM). The FIM is ideally suited for this research because of its excellent atomic resolution and the ability to examine the interior of the specimens as a result of the field-evaporation effect. This paper summarizes, in outline form: (1) the main experimental programs; (2) the principal experimental quantities determined from the analyses performed on all the individual depleted zones (DZs) observed; (3) a number of the more important results and conclusions concerning the vacancy structure of DZs; and (4) the three-dimensional spatial distribution of self-interstitial atoms detected around DZs in tungsten which had been irradiated and examined in situ at <10 K.
  Series Issue ISSN  
Medium
  Expedition Notes  
Call Number  
Contribution Id (up)  
Serial URL ISBN  
no 8079
Permanent link to this record
 

 
Seidman, David N.; Current, Michael I.; Pramanik, Dipankar; Wei, Ching-Yeu Atomic resolution observations of the point defect structure of depleted zones in ion-irradiated metals Journal Article 1982 Journal of Nuclear Materials J. Nucl. Mater. 108-109 67-68 The previous termpoint defectnext term structure of individual depleted zones (DZs) created by a variety of different projectile ions, with energies in the range 1590 keV, was studied employing the field-ion microscope technique [19]. The irradiations were performed in situ at a temperature of less than. 15 K in the case of tungsten and 40 K for platinum. The fluence was always less then 1013 ions cm&#8722;2, so that each depleted zone detected was created by a single energetic projectile ion. The following variables were studied: (1) the effect of varying the initial energy of the projectile ion at constant projectile mass; (2) the effect of varying the projectile mass at constant initial energy of the projectile ion; and (3) the non-linear effects produced by employing dimer ions (W+2 and Ag+2). The analyses of the depleted zones consisted of measuring and/or determining the following quantities: (1) the number of vacancies per DZ; (2) the spatial distribution of self-interstitial atoms around the DZs in the case of tungsten; (3) the dimensions of the DZs; (4) the vacancy concentration per DZ; (5) the radial distribution function of the vacancies within each DZ; (6) the radiation damage profiles due to the cumulative effects of many DZs; and (7) the non-linear effects produced by the dimer irradiations. The results are discussed and compared with different analytical theories and computer simulations of the primary state of radiation damage. no 8285
Permanent link to this record
 

 
Current, M. I.; Wei, C. Y.; Seidman, D. N. Direct observation of the primary state of damage of ion-irradiated tungsten: II. Definitions and results Journal Article 1983 Philosophical Magazine A Phil. Mag. A 47 407-434 no 8353
Permanent link to this record
 

 
Current, Michael I.; Seidman, David N. Sputtering of tungsten: a direct view of a near surface depleted zone created by a single 30 keV63 Cu+ projectile Journal Article 1980 Nuclear Instruments and Methods 170 1-3 377-381 The vacancy structure of near-surface depleted zone (DZ), created by a single 30 keV 63Cu+ ion in a tungsten field-ion microscope (FIM) specimen, was determined with atomic resolution. Both the irradiation and pulse field-evaporation experiments were performed in situ at less, approximate11 K, so that the observed vacancy structure was unaltered by the long-range migration of self-interstitial atoms. The following basic physical quantities were measured: (1) the number of vacancies; (2) the dimensions; (3) the vacancy concentration; (4) the distribution of first-nearest-neighbor vacancy clusters; and (5) the radial-distribution function for the vacancies out to ninth-nearest neighbor. The values of these quantitieswere shown to be similar for both the near-surface DZ and DZs created in the bulk of the same specimen by 30 keV 63Cu+ projectiles. no 8862
Permanent link to this record
 

 
Cerezo, A.; Gibuoin, D.; Kim, S.; Sijbrandij, S. J.; Venker, F. M.; Warren, P. J.; Wilde, J.; Smith, W., G D Materials applications of an advanced 3-dimensional atom probe Journal Article 1996 Journal de Physique IV J. de Phys. IV 6 C5 205-210 3D Atom Probe, Technique/review An advanced 3-dimensional atom probe system has been constructed, based on an optical position-sensitive atom probe (OPoSAP) detector with energy compensation using a reflectron lens. The multi-hit detection capability of the OPoSAP leads to significant improvements in the efficiency of the instrument over the earlier serial position-sensing system. Further gains in efficiency are obtained by using a biassed grid in front of the detector to collect secondary electrons generated when ions strike the interchannel area. The improvement in detection efficiency gives enhanced performance in the studies of ordered materials and the determination of site occupation. Energy compensation leads to a much improved mass resolution (m/&#916;m full width at half maximum) making it possible to map out the 3-dimensional spatial distributions of all the elements in complex engineering alloys, even when elements lie close together in the mass spectrum. For example, in the analysis of a maraging steel, this allows separation between the 61Ni2+ and 92Mo3+ peaks, which are only 1/6 of a mass unit apart. no 1954
Permanent link to this record
 

 
Dadykin, A. A.; Naumovets, A. G.; Yatsenko, A. F.; Andreev, V. D.; Nachal'naya, T. A.; Semenovich, V. A.; Lavrentovich, Y. I. Emission characteristics of diamond-like films Journal Article 1996 Sverkhtverd. Mater. 1 25-29 Field Emission no 1968
Permanent link to this record
 

 
Choi, W. B.; Myers, A. F.; Wojak, G. J.; McClure, M. T.; Cuomo, J. J.; Hren, J. J. The effects of the interface and surface treatment on the electron emission from diamond coated field emitters Journal Article 1996 Int. Vac. Microelectron. Conf., 9th (1996), 288-292 Publisher: Nevskii Kur'er, St. Petersburg, Russia. 288-292 Field Emission no 1986
Permanent link to this record
 

 
Choi, W. B.; Cuomo, J. J.; Zhirnov, V. V.; Myers, A. F.; Hren, J. J. Field emission from silicon and molybdenum tips coated with diamond powder by dielectrophoresis Journal Article 1996 Applied Physics Letters Appl. Phys. Lett. 68 720-722 Field Emission no 2035
Permanent link to this record
 

 
Liu, J.; Zhirnov, V. V.; Choi, W. B.; Wojak, G. J.; Myers, A. F.; Cuomo, J. J.; Hren, J. J. Electron emission from a hydrogenated diamond surface Journal Article 1996 Applied Physics Letters Appl. Phys. Lett. 69 4038-4040 Field Emission no 2037
Permanent link to this record
 

 
Zhirnov, V. V.; Choi, W. B.; Cuomo, J. J.; Hren, J. J. Diamond coated Si and Mo field emitters: diamond thickness effect Journal Article 1996 Applied Surface Science Appl. Surf. Sci. 94/95 123-128 Field Emission no 2101
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Personal tools
Seidman Group
Atom-Probe Tomography
Search
Quick Search: